import turtle

t = turtle.Turtle()
t.pensize(2)
turtle.bgcolor("black")
colors = ["red","yellow","blue","green"]
t._tracer(False)
while True:
    for x in range(400):
        for y in range(200):
            t.forward(x * y)
            t.color(colors[x % 4])
            t.left(91)
    t._tracer(True)